JPS6064904A - Easily water-dispersible granular procymidone preparation, its production and method for controlling plant blight using the same - Google Patents

Abstract

PURPOSE:To provide the titled agent containing procymidone as an active component, producible by the spray-drying of an aqueous emulsion containing a water-soluble polymer as a dispersing agent, effective to control the plant blights, having higher surface tension than the diluted liquid such as emulsion, etc., and capable of improving the controlling activity and reducing the phytotoxicity. CONSTITUTION:The objective agent can be prepared by spray-drying a water-soluble dispersion containing (A) procymidone [=N-(3,5-dichlorophenyl)-1,2-dimethylcyclopropane-1,2-dicarboximide] having high activity for the control of plant blights such as stem rot, gray mold, etc., as active component, (B) optionally a proper amount of a dilutent, and (C) a water-soluble polymer as a dispersing agent. It can be applied similar to an emulsifiable concentrate and wettable powder by diluting with a large amount of water, or applied in the form of a concentrated liquid diluted with a small amount of water. Various problems caused by the frequent application of agricultural chemicals can be avoided. The use of additives other than the dispersing agent is not necessary, and the agent has low bulkiness and high fluidity, and accordingly, it is advantageous in viw of preparation, packaging, storage, transportation, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Phenyl)-1,2-dimethylcytaloproban-1.2
- dicarboximide) as an active ingredient and a water-soluble polymer as a dispersant - Procymidone easily water-dispersible granular formulation (hereinafter referred to as the formulation of the present invention) that can be formulated by spray-drying an aqueous suspension containing a water-soluble polymer as a dispersant. .) Concerning a method for producing Oyobiso and a method for controlling plant diseases using it.

Conventionally, agrochemical formulations that are diluted with water and sprayed include emulsions,
There are wettable powders, etc., but emulsions use a large amount of organic solvent as a carrier, so they have problems such as flammability, odor, toxicity, and irritation.
Depending on the active ingredient, crops may be more susceptible to chemical damage.

In addition, since wettable powders use a large amount of inorganic material as a carrier, there are problems such as fine powder scattering when formulated or diluted with water.

Procymidon is highly effective in controlling plant diseases such as sclerotium and gray mold, but it depends on the frequency and concentration of spraying, environmental conditions such as temperature and humidity, the type of crop, and its growth conditions. may cause phytotoxicity to crops, resulting in a decrease in yield or deterioration in quality.

The present inventors took these problems into consideration and, as a result of repeated studies on agrochemical formulations containing procymidone as an active ingredient, developed a formulation by spray-drying an aqueous suspension containing a water-soluble polymer as a dispersant. The present invention was completed based on the discovery that the formulation of the present invention capable of solving these problems can solve these problems.

The formulation of the present invention can be diluted with a large amount of water and sprayed in the same way as emulsions and hydrating powders, but it can also be diluted with a small amount of water and sprayed, that is, sprayed at high concentrations, and can be used as a pesticide. Avoid problems caused by large amounts of spraying. Furthermore, since it does not require any formulation aids other than a dispersant, has a small bulk, and has good fluidity, it is advantageous in various aspects such as formulation, packaging, storage, and transportation.

Dispersants used in the present invention include vegetable thickening agents such as sodium alginate, gum arabic, and gum tragacanth;
Celluloses such as methyl cellulose and carboxymethyl cellulose, water-soluble synthetic polymers such as polyvinyl alcohol, sodium polyacrylate, and polyethylene glycol, likunin sulfonic acid, alkylaryl sulfonic acid, alkylnaphthalene sulfonic acid, and polymarine condensates, or their Examples include gold R salts and mixtures thereof. Additionally, if necessary, Citera'7'J sulfate,
A small amount of dodecylbenzene sulfonate or the like may be added.

The active ingredient procymidone contains A,
Sugar, glucose, lactose, polysaccharides such as dextrin, ammonium sulfate, ammonium phosphate, ammonium chloride 1
．． It may be used in combination as a fertilizer such as urea, inorganic substances such as kaolin, calcite, and talc, and active ingredients such as polystyrene, polyvinyl chloride, and polyethylene.

The formulation of the present invention contains the active ingredient in a weight ratio of 10 to 95'/
l, preferably 50-90%, and 8-90% dispersant
, preferably 5 to 50%, and if necessary, an appropriate amount of filler.

The formulation of the present invention is produced by finely pulverizing procymidone together with fillers and other solid agricultural chemicals as necessary using a dry pulverizer such as a hammer mill or jet mill, and dispersing this in an aqueous solution of a water-soluble polymer. Procymidone is made into an aqueous suspension or added to an aqueous solution of a water-soluble polymer, along with bulking agents and other solid pesticides if necessary, to give a concentration of 0.5 to 2.
■Wet-grind into an aqueous suspension using a wet-grinding machine such as an attriter or sand grinder using diameter glass beads.
This can be spray-dried using a spray dryer to form a formulation. The particle size of the active ingredient in the aqueous suspension is 20μ or less, preferably 104 or less, and the amount of the active ingredient is 20 to 70%,
Preferably it is 30-60%. Spray drying is carried out at a pressure of 1'
JKi nozzle and its nozzle orifice diameter is (15-
8,0tm, spray pressure is 8-20 h/ca,
It is preferable to use a spray dryer with a drying temperature of 150'C or more at exhaust temperature. The preparation of the present invention prepared in this manner is a granular preparation having a particle size of about 1 to 1.0 mm, and when diluted with water, the active ingredient procymidone becomes 250 to 500 ppm. If you do this,
The surface tension of the water-diluted liquid is 60 dyn/z or more, which is higher than the surface tension of water-diluted liquids such as emulsions and wettable powders, which can improve efficacy and reduce chemical damage.

Next, examples will be shown. Parts are parts by weight.

Example 1 80 parts of procymidone, 15 parts of sodium dinaphthylmethane disulfonate, and 5 parts of sodium genin sulfonate were dissolved in 200M water.
The mixture was ground for 60 minutes in a sand grinder using 300 parts of a ~28 mesh glass spoon. Next, the glass beads were separated using a 6-meter mesh wire mesh, and spray-dried at a spray pressure of 10 KyAr/1 using a hot air co-current spray dryer equipped with a pressure spray nozzle with a nozzle orifice diameter of L OiIn to obtain 80% bromidone water. A dispersible granular formulation was obtained. This formulation has 92% granules of 32 to 100 mesh;
When it is diluted with water so that procymidone is 400 ppm, the surface tension of the water diluted solution is 69 dy n10
It was n.

Example 2 50 parts of procymidone was added to an aqueous solution prepared by dissolving 20 parts of a sodium alkylnaphthalene sulfonate formalin condensate, 2 parts of gum arabic, and 28 parts of urea in 150 parts of water, wet-pulverized in the same manner as in Example 1, and spray-dried. A 50% procymidone easily water-dispersible granular preparation was obtained.

This formulation contains 3.2% granules with a mesh size of 32 or more.
85% of the granules are ~60 mesh, 11.8% are granules of 60% mesh or less, and procymidone has 500 mesh.
When diluted with water to a ppm, the surface tension of the water diluted solution is 6 B (lyn/cm).

Next, efficacy test examples and drug damage test examples using the present invention preparation and a commercially available 50% procymidone hydrating agent will be shown.

Efficacy test example Cucumber gray mold control efficacy Diameter 9Lyn
A water diluted solution of the preparation of the present invention and a commercially available 50% procymidone wettable powder was sprayed on Cucurbita I+ 2 at the cotyledon stage grown in a flower pot using a spray gun so that the leaves were sufficiently adhered to the leaves.

Gray mold fungus (B
otrytis cinerea) was inoculated and kept at 25°C in a humid environment. Three days after inoculation, the disease severity was determined by measuring the lesion diameter, and the control value was calculated according to the following formula9.
Shown in the table.

Incidence: Lesion diameter 0 No lesions 1 Less than 5 parts 2 More than 5 parts to less than LO 4 More than 10 m to less than 1% <1% 8 More than 15 parts Table 1 Diameter of drug damage test examples Water dilutions of the formulation of the present invention and a commercially available 50% procymidone hydrating powder were applied to new shoots of grapes (Plate: Delaware) grown in a 9 cIn flower pot using a small automatic sprayer at a temperature of +p to the extent that the leaf surface was sufficiently sprayed. Spread. Sixteen days after spraying, the pharmacological area ratio was investigated to determine the phytotoxicity index, and then the degree of phytotoxicity was determined according to the following formula. The results are shown in Table 2.

Drug damage index Pharmacological area ratio 0 No pharmacology 1 Less than 5% 2 5% or more to less than 30% 8 80% or more to less than 60% 4 60% or more to less than 80% 5 80% or more Continued from page 1 [F] / Issue Author: Takashi Tsuji [F] / Inventor: No. 1) 3-1-98, Kasugade-naka, Konohana-ku, Osaka City Jumin Kagaku Kogyo Co., Ltd. Shio-no-yama, Kishiro-cho, Kasai City (no address) Procedures? 11j Tadashi Rose (spontaneous) November 4, 1981 - Day 1, Description of the case 1982 Patent Application No. 171884 2, Title of the invention Procymidone easily water-dispersible granular preparation, its manufacturing method, and plant diseases using the same Relation to the Amendment Control Act 3 and the Amendment Case Patent Applicant Address 5-15 Kitahama, Higashi-ku, Osaka Name (209)
) Sumitomo Chemical Co., Ltd. Representative: Takeshi Hijikata 4, Agent address: 5-15 Kitahama, Higashi-ku, Osaka Details of the invention in the specification 6) Column 6, Contents of amendment + 11 Specification oath, page 5, line 11 For the eyes, "the amount of active ingredients"
The statement has been corrected to read, ``The total melting amount of the active ingredient, water-soluble polymer, and optionally added thickener is''.

(2) On page 5, line 15, "l 50'C or more"
Correct the statement to read "below 150℃."

that's all

Claims (1)

[Scope of Claims] (1) The active ingredient is D-siton (N-(3,5-dichlorophenyl)-1,2-dimethylcyclopropane-1,2-dicarboximide), which has high water solubility. An easily water-dispersible granular preparation of procymidone characterized by using a molecule as a dispersant. (2) A method for producing an easily water-dispersible granular preparation of procymidone, which is characterized by spray-drying an aqueous suspension consisting of procymidone and a water-soluble polymer. (8) Using an easily water-dispersible granular preparation of procymidone A method for controlling plant diseases characterized by: